better：优化做梦表现

src/dream/tools/update_chat_history_tool.py

@@ -0,0 +1,54 @@
+from typing import Any, Dict, Optional
+
+from src.common.logger import get_logger
+from src.common.database.database_model import ChatHistory
+from src.plugin_system.apis import database_api
+
+logger = get_logger("dream_agent")
+
+
+def make_update_chat_history(chat_id: str):  # chat_id 目前未直接使用，预留以备扩展
+    async def update_chat_history(
+        memory_id: int,
+        theme: Optional[str] = None,
+        summary: Optional[str] = None,
+        keywords: Optional[str] = None,
+        key_point: Optional[str] = None,
+    ) -> str:
+        """按字段更新 chat_history（字符串字段要求 JSON 的字段须传入已序列化的字符串）"""
+        try:
+            logger.info(
+                f"[dream][tool] 调用 update_chat_history(memory_id={memory_id}, "
+                f"theme={bool(theme)}, summary={bool(summary)}, keywords={bool(keywords)}, key_point={bool(key_point)})"
+            )
+            record = ChatHistory.get_or_none(ChatHistory.id == memory_id)
+            if not record:
+                msg = f"未找到 ID={memory_id} 的 ChatHistory 记录，无法更新。"
+                logger.info(f"[dream][tool] update_chat_history 未找到记录: {msg}")
+                return msg
+
+            data: Dict[str, Any] = {}
+            if theme is not None:
+                data["theme"] = theme
+            if summary is not None:
+                data["summary"] = summary
+            if keywords is not None:
+                data["keywords"] = keywords
+            if key_point is not None:
+                data["key_point"] = key_point
+
+            if not data:
+                return "未提供任何需要更新的字段。"
+
+            await database_api.db_save(ChatHistory, data=data, key_field="id", key_value=memory_id)
+            msg = f"已更新 ChatHistory 记录 ID={memory_id}，更新字段={list(data.keys())}。"
+            logger.info(f"[dream][tool] update_chat_history 完成: {msg}")
+            return msg
+        except Exception as e:
+            logger.error(f"update_chat_history 失败: {e}")
+            return f"update_chat_history 执行失败: {e}"
+
+    return update_chat_history
+
+
+